Radiotelegraph transmitting system



0. C. VROOS.

RADIOTELEGRAPH TRANSMITTING SYSTEM. APPLIICATIE'HQQFJLED JULY 14. 19:1.

I) Patented July 15, 1919.- I 1' 1 5} J J Ag?! iF entries,

- ill-SCAR (3.

R905, 0E ALLSTOH, WSACHUSETTS.

WEOEELEGEM WTSBEIITTWG SYSTEM.

To all whom it may concern:

Be it known that I, Oscen C. Roos, a citizen of the United States, and a resident of Allston,. in the county of Sufiolk and State of Massachusetts, have invented a new and useful 1m rovement in Radiotelegraph Transmitting stems, of which the following is a specification My invention relates to transmitting systems and more es systems which are energized by an antially continuous oscillations such as those developed by an oscillating-arc circuit.

In systems of this type the oscillations developed in the antenna are cnerally not simple harmonic but consist o a fundamental and various multiples thereof, the higher of which if reinforced by antenna resonance are generally of considerable amplitude.

The existence of these hi her harmonics imposes a limitation to e cient selective transmission and it is therefore the main object of my invention to provide means for absorbing the higher harmonics so that the transmitted electromagnetic waves wi substantially simple harmonic. A further object of my invention "is to provide means for rectifying such higher harmonics and for utilizing the energy of the resulting unidirectional impulses to assist the main curradio-telegraph rent in feeding the arc.

Two illustrative embodiments of my invention are shown conventionally in the accompanying drawings but it will be undervarious modifications may be and the system from the prinstood that made both in the apparatus of circuits without departing ple of my invention.

In the drawings- Figure 1 is a diagram of a radio-telegraph transmitting system involving my invention; and Fig. 9. is a diagram of the modification.

A transmitting antenna T is associated in any suitable manner are circuit containing the condenser and electrodes A, said antenna being shown in the present instance as serially connected transformer M and as grounded at E.

- lnductively associated with the antenna systemwhich is attuned to a predetemnined fundamental frequency, said frequency being determined by the antenna itself and its associated circuit or circuits, is a circuit M -C, M, C, L attuned to the frequency oi specification of Letters Patent. Application filed July is, 191'). serial No. 180,527,

cially to i with the oscillating said circuit through the primary of the Patented July as, rate.

one of the multiples of said fundamental frequency, said circuit being shown in Fig. 1 as including the secondary of the transformer M, the primary of the transformer M,-the condenser C, and a paralleLbranch circuit, one branch of which contains the condenser G" or an equivalent capacity, and the other the inductance L f or an equivalent inductance, The parallel branch circuit is so attuned as to have a maximum impedance at the fundamental of said antenna sys-- tem,for example said circuit may be attuned to the frequency of the fundamental of the antenna system, so that for currents of said fundamental frequency the circuit M, C, M, C, L" will have a practically infinite impedance.

As shown in Fig. 2 the anti-resonant circuit C", L" may be omitted ii the circuit M, C, M is made highly selective.

The harmonics developed in the antenna system by an oscillating-arc circuit which do the greatest damage are the higher harmonies from the fifth to the thirteenth, but it will be understood however that my invention is not limited to use wifi an antenna system energized by an oscillating-arc cirdesired to absorb one or more harmonics irrespective of cillations are created. vIt will also be under stood that two or more absorbing circuits may be used to eliminate two or more harmonies and that where an oscillating-arc circuit is used to energize the antenna, two or more such absorbing circuits are preferable, as indicated in Fig. 2, in which the circuit M, G, M", represents a second a in circuit.

, e energy of the higher harmonic oscillations absorbed from the antenna system may be utilized for assisting the main current in feeding the arc and to this end I may use any suitable means capable. of rectifying such oscillations. For this purpose I prefer the well known ment V which serves to rectify both'pulses of the oscillations translated from the absorbing circuit to-the secondary of the transformer M, and-the resulting unidirectional current is impressed upon the are by conductors which include the choke coils I, I, and the regulator R. Where two or more absorbing circuits are used, the rectifiers are all connected cated in Fig. 2 in which V, d8 a conthe manner in which the osrectifying. arrangeto said conductors, as indispark but so far as l 5 5 therein,

nected a) on" secondary of the transformer M As shown in the present instance the arc circuit is energized by the direct current 5 generator G which is, connected thereto through choke coils I, 1. While for illustrative purposes I have shown my invention as applied to a radio-telegraph system, it will, of course, be understood. that it may he used 1 with advantage in any other type of electromagnetic Wave radiating system.

As indicated the transformer M, M may be designed for variable spatial separation of the primary and secondary windings. It will be apparent that the absorbing circuit or circuits may be coupled to the antenna system in of the usual Ways in which resonant circuits are associated with an tenna system.

Various arrangements have been proposed for insurii ig the simple harmonic vibration of the antenna of a coupled system in which the oscillations are created by. the periodic disruptive discharge of a condenseracross a am aware it is broadly new with me to so arrange matters that the electromagnetic waves transmitted from an antenna system energized by an oscillatingare circuit are simple harmonic in 3 form. By the term oscillating-arc circuit as used herein I desire to be understood as meanin circuit which includes a condenser and arc-elcctrcdes or other device or devices so arranged that when said circuit is energized by direct current substantially contin uous oscillations produced.

Having described illustrative embodiments 0:? my invention without however limiting the same thereto, what I claim and desire to secure by Letters Patent is:

1. A radiotelegraph transmitting system, comprising, in combination an antenna system, means for creating electrical oscillations therein, a. circuit associated with the 4-5 antenn and attuned to one of the harmonics the fundamental branch circuit,

a capacity rially connected with said circuit, said parallehbranch circuit being ttuned to the fundamental of said antenna stem.

2. A radio-telegraph transmitting system, comprising in combination an antenna systern, means for creating electrical oscillations a circuit associated with the antenna and attuned to one of the harmonics of the fundamental thereof, and a parallel-branch cirouit, one branch of whichincludes a capacity and the other an inductance, serially one branch of which includes connected with said circuit, said parallel branch circuit being so attuned as to have a maximum impedance at the fundamental of said antenna system.

3. A radio-telegraph transmitting system,

comprising in combination an antenna systhereof, and a paralleland the other an inductance, se-

tern, means for creating electrical oscillations therein, a circuit associated with the an tenna and attuned to one of the harmonics of the fundamental thereof, and a parallelbranch circuit, one branch of which acts as an equivalent capacity and the other as an equivalent inductance, serially connected with said circuit, said parallel branch circuit being so attuned as to have a maximum imedance at the fundamental of said antenna system.

4. A radio-telegraph transmitting system, comprising in combination an antenna system having a definite fundamental frequency, an oscillating-arc circuit arranged for creating therein electrical oscillations of said frequency, a circuit associated with the antenna and attuned to one of the multiples of said frequency, and a parallel-branch circuit, one branch of which includes a capacity and the other an inductance, serially connected with the last mentioned circuit, said parallelbranch circuit being attuned to the fundamental of said antenna system.

5. A radio-telegraph transmitting system, comprising in combination an antenna systern having a definite fundamental frequency,

an oscillating-arc circuit arranged for creating therein electrical oscillations of said frequency, a circuit associated with the antenna and attuned to one of the multiples of said frequency, and a parallel-branch circuit, one branch of which includes a capacity and the other an inductance, serially connected with the last mentioned circuit, said parallel branch circuit being attuned so as to have a maximum impedance at the fundamental of the said antenna system.

6. A radio-telegraph transmitting system, comprising in combination an antenna system having a definite fundamental frequency, an oscillatingarc circuit arranged for creating therein electrical oscillations of said frequency, a circuit associated with the antenna and attuned to one of the multiples of said frequency, and a parallel-branch circuit, one branch of which acts as an equivalent capacity and the other as an equivalent inductance, serially circuit, said parallel-branch circuit being at tuned So as to have a maximum impedance at the fundamental of the said antenna system.

7. A radio-telegraph transmitting system, comprising in combinationan antenna system, an oscillating-arc circuit arranged for creating electrical oscillations therein, a circuit associated with the antenna and at tuned to one of theharmonics of the fundamental thereof, means associated with the last mentioned circuit for rectifying the oscillatious absorbed therein and means for impressing the resulting unidirectional cur rent on the arc circuit.

8. A radio-telegraph transmitting system, comprising in combination an antenna sysconnected with the last mentioned tern, an oscilieting'zirc circuit arrangeci for creating electrical escillations therein, a cii-- cult associateci with the antenna and ettuned so as to have a maximum impatience at the frequency of the fundamental of saidcomprising in combination an antenna system, an oscillating-ere circuit arranged for creating electrical oscillations therein, it circuit associated with the antenna and attuneci to one of the harmonics of the fundamental thereof, means associated with the last mentioned circuit for rectifying "00th the 'positive and the negative puises of the osciilations absorbed therein and means for 1mpressing the resulting unidirectional current on the arc circuit,

10. A radiwtelegrepii transmitting system, comprising in combination en antenna system, an oscillating-are circuit arrenge'ri for creating electrical oscillations therein, a circuit associated with the antenna and ettuned so as to have a maximum. impedance at the frequeney of the said antenna system ande minimum xmpedence at the freqency of one of the harmonics of said fundamental, me the last mentioned circuit for rectifying both fundamental of en's associated with the positive and the negative pulses of the oscillations absorbed therein and means for impreesi the resulting unidirectional cur rent on. t e are on'cult.

In testimony whereof, 1. have hereunto subscribed my name this End-day (if-July,

OSCARC. RODS. 

